do you have low electricity? with that amount you can easily buy around 12 rig, and with cheap consumption it's possible to generate around 2.4 btc per month
but you need proper cooling and something like 10kw of power to run this little farm, i'm somehow interested in a partner because i have high electricity
if i could find someone to host my rig it would be good, but the trust is an issue, we need to overcome that
I would challenge you on that good Sir!
with the point of: What happens when ETH goes PoS? One could say "well theres always other coins to mine" but lets not kid ourselves, Casper will unleash maybe 1 MILLION (more?) GPUs needing something to mine. Could you in good conscience tell someone to invest in rigs in right now?
@OP given you have a larger amount, i would throw in in say a service like HaoBTC. they only take over 10BTC, have WAY better rates than a bank, and absorb ALL the risk. If you want something hands free its smiley imo.
IF you want something hands on, start trading, man even the MARGINS at polo will pay nice with 15k to play with and i think anyone can agree lending there is about a safe bet.